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In Drosophila, the Autosomal Recessive Pr and Cn Mutations Cause

Question 53

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In Drosophila, the autosomal recessive pr and cn mutations cause brown and bright-red eyes, respectively (wild-type flies have brick-red eyes) .Flies who are homozygous recessive at both pr and cn have orange eyes.A female who has wild-type eyes is crossed to an orange-eyed male.Their progeny have the following distribution of eye colors:
 wild-type  8  brown 241 briphit-red 239 orarnge 12500\begin{array} { | l | r | } \hline \text { wild-type } & \text { 8 } \\\hline \text { brown } & 241 \\\hline \text { briphit-red } & 239 \\\hline \text { orarnge } & \underline{12} \\\hline & 500 \\\hline\end{array}
-Which phenotypes are parental?


A) wild-type and orange
B) brown and bright-red
C) wild-type and brown
D) bright-red and orange
E) There is no way to determine this.

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